According to Pat Leonard of the New York Daily News, Callahan began skating a week ago, but there is no exact timetable for his return. The leader of the team could miss the first month of the season, according to Leonard.

The Rangers will kick off their preseason schedule against the Devils on September 16. The regular season will begin a little over two weeks later, when the Rangers visit the Coyotes in the opener on October 3.

Callahan scored 16 goals and dished out 15 assists in 45 games in the lockout-shortened season.

Despite his injury, he didn’t miss any time in the postseason.

Callahan played in all 12 of the Rangers’ playoff games, amassing five points (two goals and three assists).